Is there a black turbo Cobra in Roanoke?
11-28-2006, 06:22 AM
#31
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Re: Is there a black turbo Cobra in Roanoke?
Really? I haven't researched a lot about the 4v's. I just know they are much more expensive when you start doing this kind of thing. I might start small and do a turbo 5.0 with low boost. Any reason not to? I know the blocks are weak... But I wouldn't want to spend a lot of money until maybe later.
When you get down to it, the 4v isn't more expensive to build. Mostly because you start out with a block you can use, and Steel crank. On my 96 Cobra, I replaced the rods and pistons, of course ARP head and main studs and put plenty of boost to it. Used the stock heads, cams and intake. That car made 632 RWHP.
On the other hand, with the 5.0, to have an equally strong bottom end, you would need a full rotating assembly (Crank, rods, pistons) Still need ARP head and main studs, Aftermarket cam, heads, intake, rolloer rockers, pushrods, etc. We haven't even got into the fact that you need an R302 block which last time I checked costs about $1700--Unmachined!! You get the picture.
On my 1990 LX 5.0, Im cracked the block on 12 psi from a Vortech T-trim, and I lost count of how many head gaskets it puked. On the 96 Cobra with 19 psi non-intercooled boost from a T-trim and a little bit of nitrous, I never blew it up.
Steve
We're not that bad.
11-28-2006, 07:03 AM
#33
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11-28-2006, 08:21 AM
#34
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Re: Is there a black turbo Cobra in Roanoke?
When you get down to it, the 4v isn't more expensive to build. Mostly because you start out with a block you can use, and Steel crank. On my 96 Cobra, I replaced the rods and pistons, of course ARP head and main studs and put plenty of boost to it. Used the stock heads, cams and intake. That car made 632 RWHP.
On the other hand, with the 5.0, to have an equally strong bottom end, you would need a full rotating assembly (Crank, rods, pistons) Still need ARP head and main studs, Aftermarket cam, heads, intake, rolloer rockers, pushrods, etc. We haven't even got into the fact that you need an R302 block which last time I checked costs about $1700--Unmachined!! You get the picture.
On my 1990 LX 5.0, Im cracked the block on 12 psi from a Vortech T-trim, and I lost count of how many head gaskets it puked. On the 96 Cobra with 19 psi non-intercooled boost from a T-trim and a little bit of nitrous, I never blew it up.
Steve
On the other hand, with the 5.0, to have an equally strong bottom end, you would need a full rotating assembly (Crank, rods, pistons) Still need ARP head and main studs, Aftermarket cam, heads, intake, rolloer rockers, pushrods, etc. We haven't even got into the fact that you need an R302 block which last time I checked costs about $1700--Unmachined!! You get the picture.
On my 1990 LX 5.0, Im cracked the block on 12 psi from a Vortech T-trim, and I lost count of how many head gaskets it puked. On the 96 Cobra with 19 psi non-intercooled boost from a T-trim and a little bit of nitrous, I never blew it up.
Steve
I guess cost wise they may be neck and neck to build if you had to buy a boss or Rblock. But I'd take a stock 351W block build a 393 stroker for about a grand, run a lightning EFI intake and you could throw just about anything at it. For probably 1/3 the cost of building a 4V modular.
11-28-2006, 08:55 AM
#36
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11-28-2006, 09:20 AM
#37
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Re: Is there a black turbo Cobra in Roanoke?
I guess cost wise they may be neck and neck to build if you had to buy a boss or Rblock. But I'd take a stock 351W block build a 393 stroker for about a grand, run a lightning EFI intake and you could throw just about anything at it. For probably 1/3 the cost of building a 4V modular.
11-28-2006, 09:44 AM
#38
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Re: Is there a black turbo Cobra in Roanoke?
Go with the Modular. For what you're wanting to do the modular is a better buy. Pick up a 96-98 Cobra motor. Build your own turbo kit (There's plenty of info on it now). I was going to build a TT kit for the 5.0 but instead went with my 150 NX kit I bought from Steve haha. Building a kit ins't as bad as one might think if you have the resources. 96-98 Cobras' are commonly making around 430-460 rwhp with basic bolt ons and a Vortech S Trim @ 8#.
If you really want to go wild do a 4v 5.4 with a T-76. That's a project close to Steve's heart.
The big blocks are nice and can make great power but the thing I just love the modulars myself.
Where do you live at?
If you really want to go wild do a 4v 5.4 with a T-76. That's a project close to Steve's heart.
The big blocks are nice and can make great power but the thing I just love the modulars myself.
Where do you live at?
11-28-2006, 11:08 AM
#39
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Re: Is there a black turbo Cobra in Roanoke?
QwkCoupe,
Mine cracked through the middle. I was turning it 5750 RPM's, via the MSD. I like the 351 idea, and at one time had planned on doing that. You can get your rotating assembly and intake, however you are leaving out several other things to go with it. You still need a set of heads, cam, roller rockers, pushrods, roller lifters (which are stupid expensive on the 351 last time I checked), different exhaust, and I think maybe a different distributor??? I seriously don't think it will only be 1/3 of the cost.
You can take a 4v and simply replace the rods and pistons. You don't NEED to work the heads, don't need to change cams, of course either one of them will need ARP studs. On my 2004 Cobra, I rebuilt the motor using forged internals for about $1900. That price includes machine work, studs, gaskets, rings, and complete longblock assembly. I pulled the motor myself to save costs.
MAD DOHC,
Personally, If i am building either one of the 2, It better hold 600-700 to the wheels. That is why you will need the r302 block. I think it would be crazy to spend the $ machining a stock block and fitting a stroker crank into it just to be worried about it splitting.
Mine cracked through the middle. I was turning it 5750 RPM's, via the MSD. I like the 351 idea, and at one time had planned on doing that. You can get your rotating assembly and intake, however you are leaving out several other things to go with it. You still need a set of heads, cam, roller rockers, pushrods, roller lifters (which are stupid expensive on the 351 last time I checked), different exhaust, and I think maybe a different distributor??? I seriously don't think it will only be 1/3 of the cost.
You can take a 4v and simply replace the rods and pistons. You don't NEED to work the heads, don't need to change cams, of course either one of them will need ARP studs. On my 2004 Cobra, I rebuilt the motor using forged internals for about $1900. That price includes machine work, studs, gaskets, rings, and complete longblock assembly. I pulled the motor myself to save costs.
MAD DOHC,
Personally, If i am building either one of the 2, It better hold 600-700 to the wheels. That is why you will need the r302 block. I think it would be crazy to spend the $ machining a stock block and fitting a stroker crank into it just to be worried about it splitting.
11-28-2006, 11:13 AM
#40
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Re: Is there a black turbo Cobra in Roanoke?
On my 2004 Cobra, I rebuilt the motor using forged internals for about $1900. That price includes machine work, studs, gaskets, rings, and complete longblock assembly. I pulled the motor myself to save costs.
MAD DOHC,
Personally, If i am building either one of the 2, It better hold 600-700 to the wheels. That is why you will need the r302 block. I think it would be crazy to spend the $ machining a stock block and fitting a stroker crank into it just to be worried about it splitting.
MAD DOHC,
Personally, If i am building either one of the 2, It better hold 600-700 to the wheels. That is why you will need the r302 block. I think it would be crazy to spend the $ machining a stock block and fitting a stroker crank into it just to be worried about it splitting.
Plenty of stock 5.0 blocks have held 600hp without cracking. I'm not arguing that the R block would be better to use, just excessive.
Last edited by MAD_DOHC; 11-28-2006 at 11:46 AM.